* Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx> wrote: > On Mon, 12 Oct, at 02:49:36PM, Ingo Molnar wrote: > > > > > > So why not unmap them after bootup? Is there any reason to call into EFI code > > while the system is up and running? > > That's where the runtime services code lives. So if you want things like EFI > variables (used by the distro installer, among other things) you need to map the > runtime regions. So EFI variables could be queried during bootup and saved on the Linux side. Calling into firmware after the kernel has booted up is fragile in general - beyond W+X the security considerations. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
